What's going on in Bush's mind here?

This long NYT retrospective on the seminal news-photos of some guy named George Bush during his presidency ends with photos of the man on his way to his farewell address, during which it appears that he's been crying in the bathroom. I've looked at it several times now and I'm not sure I agree that's what's going on -- this facial expression seems to contain a lot more than mere sorrow.

And I turned to one of my editors – First I said, “Oh, my God.” And he said, “What?” And I said, “You’ve got to see this picture of Bush. This is really stunning.” And I flipped it over to him to process and his first reaction was, “Wow.” And I said, “If he wasn’t just back there behind that door crying, I don’t know what that look on his face is.” Because he just looks absolutely devastated as he comes through this door after essentially ending his eight year presidency. And it’s just really striking. He just looks absolutely devastated.
Mirror, Mirror on the Wall (Thanks, Teresa!)

(Image: REUTERS/Jason Reed)